Crayfish
1. Perfectly symmetrical.
2011-05-20_0000.jpg
2011-05-20_0000.jpg

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2011-05-19_0003.jpg

3. Claws for defense, Tail for maneuvering in the water, hard shell for defense,legs as a mode of transportation, antennae for sensing the environment, and eyes as a sense of sight.

Starfish
  1. It is perfectly symmetrical.
  2. Appendages as transportation and a suction like stomach for food.
2011-05-20_0001.jpg
2011-05-20_0001.jpg

Pig
  1. Is symmetrical.
Legs for transportation, hair for warmth, mouth for food, anus for waste, ear for sound reception, eyes for sight, nose for smell.
2011-05-20_0002.jpg
2011-05-20_0002.jpg